Hmm, ved ikke hvad der er galt. Har hørt om det før. Har du tjekket Logitechs supportsider?
Question
When starting the camera I receive an error the camera's not present, or the camera is already in use.
Answer
Check for Other Running Video Applications
If another video application is running, the camera driver might still be in use by that application. Examples of other video applications are Yahoo! Messenger or Windows Movie Maker etc.... If another video application is running, exit out of it and then start the Logitech Camera Software.
Install the Latest Version of DirectX
Before continuing with diagnostics, please make sure you are using the latest release of DirectX. You can download the latest release here.
Unplug the camera.
Uninstall the camera software using Add/Remove Programs in the Windows Control Panel.
Click "Start", "Settings", and "Control Panel".
Double click the Add/Remove Programs icon.
Highlight the Logitech camera software and click the Add/Remove button. (Change/Remove if you are using Windows XP.)
Install the latest DirectX version from Microsoft.
Reinstall the camera software.
Verify That the Device Has Been Loaded in the Device Manager
When Windows correctly detects the Logitech video camera, it will load 2-3 entries in the Device Manager, depending on the camera being used. Please do the following:
Press the CTRL, ALT and DEL keys simultaneously to bring up the Task Manger.
End task on LVCOMS.EXE.
Open the Device Manager and remove the camera.
Click the "Start" button, "Settings", then "Control Panel". (For Windows XP and Windows 2000, click "Start", then "Control Panel.")
Double click on the "System" icon.
Click on the "Device Manager" tab. Windows XP and Windows 2000 users, click on the Hardware Tab, then the Device Manager button.
Click on the plus (+) sign next to "Imaging Device". A properly installed camera will load an entry in this section entitled "Logitech USB Video Camera". If this entry does not exist, or is listed with a yellow exclamation mark (!), remove it and proceed to the next step.
Next click on the plus (+) sign next to "Universal serial bus controller".
Remove the entry for "Logitech USB Camera" and proceed to the next step.
(For cameras with a built in Microphone.) Click on the plus (+) sign next to "Sound, Video, and Game Controllers".
Remove the entry for "Logitech USB Microphone" and proceed to the next step.
Unplug the Camera
Delete the Driver Folder and Reinstall the Driver
For the following step, please have the Logitech camera software CD readily available. Use the instructions that apply to the software version your camera uses.
ImageStudio 7.3.0 software
NOTE: the QCDriver folder might have a number at the end of the name (E.g., QCDriver2); delete this folder.
Double click on My Computer.
Open the C:\Program Files\Common Files\Logitech\
Right click on the QCDriver (or QCDriver#) folder and select "Delete."
Finally, reinstall the driver for the camera by doing the following:
Insert the Logitech ImageStudio 7.3.0 camera software CD in the CD-ROM drive. Click Cancel if the auto-run starts.
Double click on "My Computer" on the Windows Desktop. When the window opens, right click on the CD-ROM and choose "Explore."
Double click on the QCDriver folder pertaining to the QCDriver folder you deleted in the instructions above.
Double click on SETUP.EXE to reinstall the driver
QuickCam 8.x software:
Double click on My Computer.
Open the C:\Program Files\Common Files\Logitech\ folder.
Right click on the QCDRV folder and select "Delete".
Open the C:\Windows\System32\ folder.
Delete all files that start with "lv".
Open C:\Windows\Twain_32\ folder.
Right click on the QuickCam folder and select "Delete".
Finally, reinstall the driver for the camera by doing the following:
Insert the Logitech QuickCam 8.x camera software CD in the CD-ROM drive. Click Cancel if the auto-run starts.
Double click on "My Computer" on the Windows Desktop. When the window opens, right click on the CD-ROM and choose "Explore."
Double click on the BIN folder.
Double click on SETUP.EXE to reinstall the driver
Note: You may encounter a signature error during this process; just simply bypass this warning
http://logitech-en-emea.custhelp.com/cgi-bin/logitech_en_emea.cfg/php/enduser/std_alp.php?p_new_search=&p_sid=xA5NJTth&p_lva=&p_li=&p_srch=&p_sort_by=&p_gridsort=&p_row_cnt=25&p_prod_lvl1=5&p_page=1Mvh Tmanden
